Draw works



Aug. 22, 1944. c. M. ANDERSON 2,356,371

DRAW WORKS Original Filed April 26, 1940 2 Sheets-Sheet 1 N w t\ w n q a l a & Q/ k 8 o- I m N E O N Q g w w 3 a: m I N E i I N N h" 3 N Q 1 b E i 1 RE k Inventor CARL M ANDERSON 22, 1944- c. M. ANDERSON 2,355,371

DRAW WORKS Original Filed April 26, 1940 2 Sheets-Sheet 2 In ven for CARL M ANDERSON a /31a /3 claw. fliiorney Patented Aug. 22, 1944 DRAW WORKS Carl M. Anderson, Corsicana, Tex, assignor to American Well & sicana; Tex.

Prospecting Company, Cor- Original application April 26, 1940, Serial No. 331,703, now Patent No. 2,303,071, dated Novem- 'ber 24, 1942. Divided and this application October 17, 1941, Serial No. 415,471

Claims.

The invention relates to hoisting devices and has particular application to draw works to be employed in oil field operations for raising and lowering loads such as drillpipe and the like in the well.

This application is a division of my prior copending application Serial No. 331,703, filed April be communicated. to the hoisting reel. Such mechanism includes a jack shaft, operated from a source of power, a line shaft, and a drum shaft. In constructions now commonly used, in order to provide a plurality of speeds to the draw works, it is customary to drive from the jack shaft up to the lineshaft and from the lineshaft down to the drumshaft. This construction induces heavy stresses high up on the draw works frame structure, which in turn makes necessary very heavy bases to resist the heavy loads and vibration at high speed.

It is an object of this invention to provide a maximum number of speed changes between the jack shaft and the drum shaft with the minimum number of connections between those shafts.

The general object of the invention is to provide a draw works wherein the drum shaft may be driven at a maximum number of speeds from a drive shaft through a minimum number of transmission connections. 7

Another object of the invention is to provide a support for the three shafts of the draw works which have previously been indicated, which will be compact in form and particularly strong and durable but relatively light in weight. I desire to employ but one set of posts and to mount upon the base adjacent the post the bearings for the shafts in a particularly strong and durable construction.

Other objects are:

To provide a draw Works wherein all chains are stationary while drilling (i. e. when jackshaft only is turning to drive rotary sprockets, all other chains to line-shaft and drumshaft are stationary).

To provide a draw Works with center of load low with respect to supporting base, thereby eliminating necessity of very heavy frame.

To provide a simple-and compact assemblyin which all chain and moving parts may be completely enclosed, not only for safety but also for simplicity of lubrication.

A better understanding of the invention may be had by reference to the drawings herewith wherein:

Fig. 1 is a broken top plan view of a draw works embodying the invention.

Fig. 2 is an end elevation of the supporting structure showing the manner in which the shafts are mounted at their ends.

In the drawings I have shown a drive or jack shaft I mounted in bearings 2 at its ends and adapted to be rotated through a driving connection from a source of power to sprocket wheels 3 approximately midway between the ends of the shaft. Aline shaft 4 is mounted upon the base in bearings 5 at its ends, said shaft being provided with a sprocket wheel 6 at one end and a smaller sprocket wheel l at the other. A cathead 8 is mounted, on the line shaft projecting from one side of the frame.

.Also mountedupon the base 9 is a drum shaft l0 supported in bearings II in the frame. Said drum shaft has thereon a hoisting drum l2 mounted rigidly thereon. Said shaft 'has at each end thereof asprocket wheel connection with the drive shaft. A sprocket wheel l3 at one end may be connected with a sprocket 2| on the drive shaft. A sprocket wheel I 5 at the opposite end is of larger diameter and may be connected to sprocket wheels l6 on thedrive shaft. Either of these connections may be securedupon the shaft for rotation therewith by a clutch. An ordinary dental clutch i1 is shown for the sprocket wheel I3 and a similar dental clutch l 8 for the sprocket whee1'l5. Both said sprockets are idle on the shaft l0, the clutches I1 and I8 being keyed to the shaft.

With reference to the drive shaft I, it will be noted that atone end thereof is a sleeve [9 which has atone end thereof a sprocket wheel 20 and at theother end a sprocket wheel 2| which may be termed spacedpaired sprockets. The sprocket wheel 20 is'adapted to be'connected by a chain to the sprocket wheel 6 upon the line shaft. The sprocket wheel 2| is adapted to be connected across by a sprocket chainto the sprocket wheel' 'l3'upon the drum shaft. The clutch member 19' is mounted idly upon the shaft but has a clutch 22 at one end adapted to beengaged with a mating clutch member 23 to secure the sleeve l9 rotatably with the shaft l.

Upon the opposite end of the shaft l is a sleeve 24 which has a sprocket Wheel l6 at one end which may be connected across with the sprocket wheel I5 upon the drum. At the other end of the sleeve 24 is a sprocket wheel 25 which is adapted to be connected across with the sprocket wheel I upon the line shaft. This sleeve is mounted idly on the shaft but may be clutched thereto by means of the dental clutch 26 which is mounted slidably but non-rotatably upon the shaft I.

There is a drive from the shaft I providedfor the rotary which is not shown. This drive includes a sprocket wheel 21 on one end of the shaft projecting beyond the frame, said sprocket wheel being idle upon the shaft but adapted to be connected therewith to the clutch 28. This sprocket wheel may be driven when desired to operate the rotary in the usual manner.

The operation of the hoisting drum may be accomplished through the driving connection at either end of said drum. If a slow speed is desired the sprocket wheel IS on the drive shaft may be clutched into engagement with the shaft I and rotation will be communicated to the sprocket wheel I5, which may be also clutched into engagement with the .drum shaft to rotate the drum. A different speed may be obtained through connection of the sprocket wheel I3 at the opposite end of the drum. The drum will be disengaged from the clutch I8 and both the clutch 23 upon the shaft I and the clutch I'I upon the shaft I may be thrown into engagement and there will be a direct drive-to the sprocket wheel I3 uponthe drum. 7

In addition to these direct drives I may clutch the sleeve I9 to the shaft I by operating the clutch 23 and the drive may be from the sprocket wheel 20 on the shaft I to the sprocket wheel 6 upon the shaft 4. This will, by rotating 'the shaft 4, communicate a rotation from the sprocket wheel I to the sprocket wheel 25 upon the sleeve 24, thus rotating said sleeve. The drive may then be from the sprocket wheel I6 across to the sprocket wheel I upon the drum shaft and by engaging the clutch I8 with the sprocket wheel I5 the drum will be rotated with the shaft.

Similarly the clutches may beal-l disengaged and the clutch 26 on-the shaft I may be moved into engagement with the clutch upon the sleeve 24 and the sprocket sleeve 24 and the sprocket wheel 25 will thus drive the sprocket wheel I on the shaft 4 and-by rotating the shaft 4 the sprocket wheels 6 and 20, being connected, will drive the sleeve I9 and from the sprocket wheel 2| on the sleeve I9 a drive connection may be made through the sprocket wheel I3 to the drum shaft. It will be noted on examination of the arrangement shown in Fig. 1 that four separate speeds may be in communication from the ,drive shaft to the drum; By arrangement of these driving connections it is possible to have only two sprocket wheels upon the drum shaft and these may be spaced wide apart to allow a maximum length of hoisting drum upon the shaft I0. Furthermo-re,'the arrangement is particularly compact so that there are a minimum number of connections across between the shafts.

Another feature of importance is the sturdy and durable type of supports which are provided for the shafts of the draw'works. With refer- ,errce to Fig. 2, this supporting structure will be more clearly understood. I have the base member 9 mounted upon a support of any desirable construction, the base member comprising two parallel supporting beams at each end of the frame, Aswill be noted in the drawings, the

shaft I is supported within an angle 28 formed by cutting away a portion of the upper side of the beam 9 at its end. Within this angle I place a bearing block 29 which may be welded in position on the frame. This block is adapted to receive the shaft which is held in position thereon by a cap member 30 fitting about the shaft and having its end extended to receive the bolts 3|, thus securing the shaft bearing in position. It may be understood that anti-friction bearings such as are shown at 32 in dotted lines may be employed in mounting the shaft in position.

In mounting the shaft 4 a similar construction is employed. A short .post 33 is mounted upon the beam 9 and adjacent thereto is the jack post 34. These two posts are welded in position upon thebase and project upwardly therefrom, the post 33 providing a support for the bearing 35 for the shaft 4.

On the opposite side of the jack post 34 is a bearing support-36 for the drum shaft I0. Each of these bearings are supported upon approximately' triangular blocks 29, 35 and 3B, which,

as previously noted, may be welded into connection with the adjacent portion of the framework.

.The-bearing block 29 thus not only serves to support the shaft but it helps in securing the to form. a rigid supporting structure.

post 33 in position upon the framework. Similarly the bearing block 35 for the shaft '4 when welded into connection with the posts 33 and 34 willserve as a brace between these posts, helping Also the bearing block'36 when welded in position will help to brace the jack post 34 on that side and assist in forming a sturdy construction, supporting the shafts in their positions.

The structure described is particularly simple and strong and will be enabled to .endure the heavy strains to which the device is subjected.

What is claimed is:

1. A draw works of the character described including asupporting frame, a drive shaft, a line shaft and a drum shaft mounted rotatably thereon, a hoisting drum fixed to said drum shaft, 2... sprocket wheel mounted idly at each.end of said reel, means to clutch either of said sprocket -wheels to said drum shaft, a sprocket wheel fixed at each endof said line shaft, a sprocket sleeve at each end of said drive shaft mounted rotatably thereon, means to clutch said sleeves to rotate with saidtshaft, sprocket wheel and chain connections between each of said sleeves and said line shaft sprockets and also between said sleeves and said drum shaft sprocket wheels,

' other of said sprockets on each sleeve to said drum shaft. 7

3. In combination, a drive shaft, a line shaft and a drum shaft mounted rotatably in parallel relation, means to rotate said drive shaft, a drive sleeve mounted rotatably at each end upon said drive shaft, means to independently connect said sleeves to said drive shaft, driving connections between each sleeve and said line shaft and also with said drum shaft, and a hoisting reel keyed to said drum shaft.

4. In combination, a drive shaft, a line shaft and a drum shaft mounted rotatably in parallel relation, means to rotate said drive shaft, a drive sleeve mounted rotatably at each and upon said drive shaft, means to independently connect said sleeves to said drive shaft, driving connections between each sleeve and said line shaft, a hoisting drum fixed to said drum shaft, a driving member. rotatably mounted on said drum shaft at both ends of said drum, driving connections between said sleeves and said driving members, and means to clutch each of said driving members to said drum shaft.

5. A draw works comprising a frame, a drive shaft, a line shaft and drum shaft rotatable therefrom, a. hoisting drum fixed on said drum shaft, idle sprocket wheels at each end of said drum, spaced sprocket wheels fixed to said line shaft, spaced pairs of sprockets rotatab-ly mounted on said drive shaft, a driving connection between the sprockets of each pair and said idle sprockets, a driving connection between the other sprocket of each pair and said line shaft sprockets, means to independently clutch said paired sprockets to said drive shaft, and means to rotate said drive shaft.

CARL M. ANDERSON. 

